#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
	int n;
	int i=0;
	scanf("%d", &n);
	while (n != 1)
	{
		if (n % 2 == 0)
			n = n / 2;
		else
			n = (3 * n + 1) / 2;
		i++;
	}
	printf("%d", i);
	return 0;
}